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The result of updating Customer relation with customerID =6 to NULL is A. Acceptable. B. Unacceptable, br use it violates referential integrity constrains. C. Unacceptable,

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The result of updating Customer relation with customerID =6 to NULL is A. Acceptable. B. Unacceptable, br use it violates referential integrity constrains. C. Unacceptable, bec use it violates primary key constrains. D. Unacceptable, because it violates entity integrity constrains

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